Maxim MAX3869EHJ, MAX3869E-D Datasheet

General Description
The MAX3869 is a complete, single +3.3V laser driver for SDH/SONET applications up to 2.5Gbps. The device accepts differential PECL data and clock inputs and provides bias and modulation currents for driving a laser. A synchronizing input latch can be used (if a clock signal is available) to reduce jitter.
The MAX3869 also provides enable control, two current monitors that are directly proportional to the laser bias and modulation currents, and a failure-monitor output to indicate when the APC loop is unable to maintain the average optical power. The MAX3869 is available in a small 32-pin TQFP package as well as dice.
Applications
SONET/SDH Transmission Systems
Add/Drop Multiplexers
Digital Cross-Connects
Section Regenerators
2.5Gbps Optical Transmitters
Features
Single +3.3V or +5V Power Supply
64mA Supply Current at +3.3V
Programmable Bias Current from 1mA to 100mA
Programmable Modulation Current from
5mA to 60mA
Bias Current and Modulation Current Monitors
87ps Rise/Fall Time
Automatic Average Power Control with Failure
Monitor
Complies with ANSI, ITU, and Bellcore
SDH/SONET Specifications
Enable Control
*EP = Exposed Paddle. **Dice are designed to operate over this range, but are tested and
guaranteed at TA= +25°C only. Contact factory for availability.
Ordering Information
MAX3869
+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Current Monitors and APC
________________________________________________________________ Maxim Integrated Products 1
EVALUATION KIT
AVAILABLE
124 124
SERIALIZER
WITH
CLOCK GEN.
124
23
LD
25
+3.3V
+3.3V
0.056µF
0.01µF
BIASMON
MODMON
+3.3V
1000pF
BIASMAX
LATCH
ENABLE
FAIL
MODSET
APCSET
APCFILT
CLK-
CLK+
DATA-
DATA+
FERRITE BEAD
OUT+
BIAS
MD
OUT-
CAPC
124
84.5 84.5 84.584.5
MAX3869
MAX3890
Typical Application Circuit
19-1570; Rev 0; 12/99
Pin Configuration appears at end of data sheet.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
Dice**
32 TQFP-EP*
PIN-PACKAGETEMP. RANGE
-40°C to +85°C
-40°C to +85°CMAX3869E/D
MAX3869EHJ
PART
MAX3869
+3.3V, 2.5Gbps SDH/SONET Laser Driver with Current Monitors and APC
2 _______________________________________________________________________________________
IMD= 1mA
IMD= 18µA
90
ENABLE = low (Note 4)
APC open loop
(Note 3)
900
(Note 2)
(Note 5)
Sourcing 50µA
ENABLE, LATCH
(Note 6)
ENABLE, LATCH
I
BIAS
= 100mA
APC open loop
Figure 1
PECL compatible
Sinking 100µA
CONDITIONS
%
-15 15
Monitor-Diode Bias Absolute Accuracy
ppm/°C
-480 50 480
Monitor-Diode Bias Setpoint Stability
µA
18 1000
I
MD
Monitor-Diode DC Current Range
V
1.5
Monitor-Diode Reverse Bias Voltage
V
0.1 0.44
TTL Output Low Voltage FAIL
µA
100
I
BIAS-OFF
Bias Off-Current
mA
1 100
I
BIAS
mA
64 112
I
CC
Supply Current
Bias Current Range
V
2.4 VCC- 0.3 V
CC
TTL Output High Voltage FAIL
V
0.8
TTL Input Low Voltage
V
2.0
TTL Input High Voltage
µA
-1 10
I
IN
Clock and Data Input Current
ppm/°C
230
Bias-Current Stability
%
-15 15
(Note 5)Bias-Current Absolute Accuracy
mVp-p
200 1600
V
ID
Differential Input Voltage
V
VCC- VCC- VCC-
1.49 1.32 V
ID
/4
V
ICM
Common-Mode Input Voltage
UNITSMIN TYP MAXSYMBOLPARAMETER
DC ELECTRICAL CHARACTERISTICS
(VCC= +3.14V to +5.5V, TA= -40°C to +85°C. Typical values are at VCC= +3.3V, I
MOD
= 30mA, I
BIAS
= 60mA, TA= +25°C, unless
otherwise noted.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage, VCC............................................. -0.5V to +7.0V
Current into BIAS ...........................................-20mA to +150mA
Current into OUT+, OUT- ................................-20mA to +100mA
Current into MD.....................................................-5mA to +5mA
Voltage at DATA+, DATA-, CLK+, CLK-, ENABLE,
LATCH, FAIL, BIASMON, MODMON .....-0.5V to (V
CC
+ 0.5V)
Voltage at APCFILT, CAPC, MODSET,
BIASMAX, APCSET ...........................................-0.5V to +3.0V
Voltage at OUT+, OUT-.............................+1.5V to (V
CC
+ 1.5V)
Voltage at BIAS .........................................+1.0V to (VCC+ 0.5V)
Continuous Power Dissipation (T
A
= +85°C)
32-Pin TQFP-EP (derate 22.2mW/°C above +85°C) ..1444mW
Storage Temperature Range .............................-65°C to +165°C
Operating Junction Temperature Range...........-55°C to +150°C
Processing Temperature (die) .........................................+400°C
Lead Temperature (soldering, 10s) .................................+300°C
ABSOLUTE MAXIMUM RATINGS
I
BIAS/IBIASMON
A/A
37
A
BIAS
BIASMON to I
BIAS
Gain
I
MOD/IMODMON
A/A
29
A
MOD
MODMON to I
MOD
Gain
I
BIAS
= 1mA
MAX3869
+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Current Monitors and APC
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.14V to +5.5V, load as shown in Figure 2, TA= -40°C to +85°C. Typical values are at VCC= +3.3V, I
MOD
= 30mA, TA= +25°C.)
(Note 7)
Note 1: Dice are tested at T
A
= +25°C only.
Note 2: Tested at R
MODSET
= 2.49k, R
BIASMAX
= 1.69k, excluding I
BIAS
and I
MOD
.
Note 3: Voltage on BIAS pin is (V
CC
- 1.6V).
Note 4: Both the bias and modulation currents will be switched off if any of the current set pins are grounded. Note 5: Accuracy refers to part-to-part variation. Note 6: Assuming that the laser to monitor-diode transfer function does not change with temperature. Guaranteed by design and
characterization.
Note 7: AC characteristics are guaranteed by design and characterization. Note 8: Measured with 622Mbps 0-1 pattern, LATCH = high. Note 9: PWD = (wider pulse - narrower pulse) / 2. Note 10: See Typical Operating Characteristics for worst-case distribution.
I
MOD
= 5mA
300
78
LATCH = high, Figure 3
LATCH = high, Figure 3
20% to 80% (Note 8)
ps
69
(Note 8)
20% to 80% (Note 8)
ENABLE = low (Note 4)
I
MOD
= 60mA
(Note 5)
Jitter BW = 12kHz to 20MHz, 0-1 pattern
(Notes 8, 9)
CONDITIONS
t
R
Output Rise Time ps
ps
p-p
720
Jitter Generation
ps
14 50
PWDPulse-Width Distortion
mA
560
I
MOD
Modulation-Current Range
ps
100
t
H
ps
100
t
SU
Input Latch Setup Time
Input Latch Hold Time
bits
80
Maximum Consecutive Identical Digits
ns
250
Enable/Start-Up Delay
%
±15
Output Aberrations
79
t
F
Output Fall Time
µA
200
I
MOD-OFF
Modulation-Off Current
ppm/°C
-480 -8 480
Modulation-Current Stability
%
-15 15
Modulation-Current Absolute Accuracy
87 (Note 10)
UNITSMIN TYP MAXSYMBOLPARAMETER
MAX3869EHJ
MAX3869E/D
MAX3869EHJ
MAX3869E/D
DATA+
DATA-
(DATA+) - (DATA-)
I
OUT
+
100mV MIN
800mV MAX
200mVp-p MIN
1600mVp-p MAX
I
MOD
Figure 1. Required Input Signal and Output Polarity
MAX3869
+3.3V, 2.5Gbps SDH/SONET Laser Driver with Current Monitors and APC
4 _______________________________________________________________________________________
CLK
DATA
t
CLK
= 402ps
t
SU
t
H
Figure 3. Setup/Hold Time Definition
0.056µF
OUT+
BIAS
OUT-
A
B
A
A, B ARE SMD FERRITE BEADS: B = BLM11A601S MURATA ELECTRONICS A = BLM21A102S MURATA ELECTRONICS
B
V
CC
50
15
OSCILLOSCOPE
50
25
0.056µF
V
CC
MAX3869
I
OUT
+
Figure 2. Output Termination for Characterization
Typical Operating Characteristics
(V
CC
= +3.3V, load as shown in Figure 2, TA= +25°C, unless otherwise noted.)
EYE DIAGRAM
(2.488Gbps, 1300nm FP LASER,
1.87GHz FILTER, 32 TQFP-EP)
MAX3869-01
48ps/div
MITSUBISHI ML725C8F LASER DIODE
0
5
15
10
20
25
84
83
87
32 TQFP-EP I
MOD
= 30mA
MEAN = 87.3ps σ = 1.6ps
88 90
89
8685
91
92
TYPICAL DISTRIBUTION OF FALL TIME
MAX3869-02
FALL TIME (ps)
PERCENT OF UNITS (%)
0
5
20
15
10
30
25
35
114.5
113
119
32 TQFP-EP I
MOD
= 60mA
V
CC
= 3.14V
T
A
= +85°C
MEAN = 119.1ps σ = 2.0ps
120.5 123.5
122
117.5116
125
126.5
DISTRIBUTION OF FALL TIME
(WORST-CASE CONDITIONS)
MAX3869-03
FALL TIME (ps)
PERCENT OF UNITS (%)
MAX3869
+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Current Monitors and APC
_______________________________________________________________________________________ 5
120
0
110
100
300
I
BIASMAX
vs. R
BIASMAX
MAX3869-07
R
BIASMAX
(k
)
I
BIASMAX
(mA)
40
80
100
20
60
1.2
0
0.1 1 10 100
IMD vs. R
APCSET
0.4
MAX3869-09
R
APCSET
(k
)
I
MD
(mA)
0.6
0.8
1.0
1.1
0.3
0.2
0.1
0.5
0.7
0.9
100
0
1 10 100
I
MOD
vs. R
MODSET
20
10
MAX3869-08
R
MODSET
(k
)
I
MOD
(mA)
40
30
60
70
50
80
90
0
10
60
50
40
30
20
90
70
80
100
-40 -15 10 35 60 85
SUPPLY CURRENT vs. TEMPERATURE
(EXCLUDE I
BIAS
, I
MOD
, 25 LOAD)
MAX3869-10
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
VCC = +5.5V
VCC = +3.14V
0
10
30
20
40
50
-40 -15 10 35 60 85
BIAS-CURRENT MONITOR GAIN
vs. TEMPERATURE
MAX3869-11
TEMPERATURE (°C)
GAIN (I
BIAS
/I
BIASMON
)
I
BIAS
= 100mA, I
MOD
= 50mA
I
BIAS
= 10mA, I
MOD
= 10mA
ELECTRICAL EYE DIAGRAM
(I
MOD
= 30mA, 213-1 +80 CID, 32 TQFP-EP)
MAX3869-04
100ps/div
250mV/div
ELECTRICAL EYE DIAGRAM
(I
MOD
= 60mA, 213-1 +80 CID, 32 TQFP-EP)
MAX3869-05
100ps/div
400mV/div
3.0
4.0
3.5
5.0
4.5
6.0
5.5
6.5
7.5
7.0
8.0
5 15202510 30 35 40 45 50
RANDOM JITTER vs. I
MOD
MAX3869-06
I
MOD
(mA)
RANDOM JITTER (psp-p)
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, load as shown in Figure 2, TA= +25°C, unless otherwise noted.)
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